<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <button>click</button>
    <script>
      document.querySelector("button").addEventListener("click", function () {
        console.log("bubble");
      });
      document.querySelector("button").addEventListener(
        "click",
        function () {
          console.log("capture");
        },
        true
      );
      // 执行结果
      // buble
      // capture
    </script>
  </body>
</html>
